12Troubleshooting the NIC

3CR990B-FX-97 NIC

LED

State

Meaning

 

 

 

100 LNK

Green

If drivers are installed, the 100BASE-FX connection is

 

 

active; there is a good connection between the NIC and

 

 

the hub or switch.

 

 

 

 

Blinking

N/A

 

 

 

 

Off

Something is preventing the connection between the

 

 

NIC and the hub or switch.

 

 

 

ACT LNK

Yellow

Heavy network traffic is present.

 

 

 

 

Blinking

Network traffic is present.

 

 

 

 

Off

No network traffic is present.

 

 

 

Viewing the NIC LEDs in the Diagnostics Program

To view the LEDs in the 3Com NIC Diagnostics program:

1Make sure that the NIC, the network driver, and the 3Com NIC Diagnostics program are installed.

NOTE: For instructions on using the 3Com NIC Diagnostics program, see “Using the 3Com NIC Diagnostics Program” on page 47.

2Open the Windows Start menu.

3Select Programs, and then 3Com NIC Utilities.

4Click 3Com NIC Doctor.

The 3Com NIC Diagnostics General screen appears and displays following LEDs:

•Link — lights if there is a valid connection between the NIC and the network.

•Transmit — lights if the NIC is transmitting information.

•Receive — lights if the NIC is receiving information.

Troubleshooting Problems with the LEDs

If a Link LED indicates a problem, check the following to ensure that:

1Your network hub or switch and the cable connecting to your NIC comply with the specifications appropriate for your network connection.

2The hub or switch is powered on.

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